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Related Concept Videos

Protein Folding01:25

Protein Folding

Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:22

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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
Insertion of Single-pass Transmembrane Proteins in the RER01:26

Insertion of Single-pass Transmembrane Proteins in the RER

Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
Integral transmembrane proteins possess transmembrane and extra membrane domains. The transmembrane domains are primarily made of 20-25 hydrophobic amino acids arranged in a helical secondary confirmation. These...

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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
10:09

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy

Published on: April 28, 2011

The transition state for integral membrane protein folding.

Paul Curnow1, Paula J Booth

  • 1Department of Biochemistry, School of Medical Sciences, University of Bristol, University Walk, Bristol BS8 1TD, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|January 15, 2009
PubMed
Summary

This study reveals how membrane proteins, like bacteriorhodopsin, fold differently from water-soluble proteins. Using Phi-value analysis, researchers found helix B is largely structured in the transition state, offering new insights into membrane protein folding mechanisms.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Membrane Protein Folding Dynamics
  • Protein Engineering

Background:

  • Cellular biology depends on molecular self-assembly, but principles of protein folding are mainly derived from water-soluble proteins.
  • Membrane proteins, comprising one-third of cellular proteins, face unique folding challenges due to hydrophobic environments.
  • Understanding membrane protein folding is crucial for comprehending cellular function and disease.

Purpose of the Study:

  • To investigate the folding transition state of bacteriorhodopsin, an alpha-helical membrane protein.
  • To apply the Phi-value analysis method, traditionally used for water-soluble proteins, to a membrane protein system.
  • To elucidate the structural features and folding dynamics of membrane proteins during their transition state.

Main Methods:

  • Utilized Phi-value analysis, a protein engineering technique, to probe the folding transition state.
  • Introduced single-point alanine mutations in helix B of bacteriorhodopsin.
  • Analyzed the impact of destabilizing mutations on folding activation energy and transition state position.

Main Results:

  • High Phi values (>0.8) for most mutations in helix B indicate significant structure in the transition state.
  • Lower Phi values (0.3 and 0.5) for residues Y43 and T46 suggest reduced native structure in specific regions.
  • Destabilizing mutations increased activation energy and caused an apparent transition state shift towards the unfolded state, differing from the Hammond effect in soluble proteins.

Conclusions:

  • Phi-value analysis is applicable to membrane proteins, providing critical insights into their folding.
  • Helix B of bacteriorhodopsin is substantially structured during the folding transition state.
  • The folding behavior of membrane proteins, particularly the effect of mutations on the transition state, contrasts with that of water-soluble proteins.